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bool StartRecording(const char* filename) outputFile.open(filename, std::ios::binary); if (!outputFile.is_open()) return false; // Write WAV header (placeholder) WriteWAVHeader(0, pwfx->nSamplesPerSec, pwfx->nChannels, 16); // Start audio capture HRESULT hr = pAudioClient->Start(); if (FAILED(hr)) return false; std::cout << "Recording... Press Enter to stop\n"; BYTE* pData; UINT32 framesAvailable; DWORD flags; while (true) // Wait for audio data DWORD waitResult = WaitForSingleObject(hEvent, 1000); if (waitResult == WAIT_OBJECT_0) hr = pCaptureClient->GetBuffer(&pData, &framesAvailable, &flags, NULL, NULL); if (SUCCEEDED(hr)) if (framesAvailable > 0) // Calculate bytes to write UINT32 bytesToWrite = framesAvailable * pwfx->nBlockAlign; outputFile.write(reinterpret_cast<char*>(pData), bytesToWrite); // Check for silence (optional) if (flags & AUDCLNT_BUFFERFLAGS_SILENT) // Handle silent buffer if needed pCaptureClient->ReleaseBuffer(framesAvailable); // Check for Enter key if (GetAsyncKeyState(VK_RETURN) & 0x8000) break; // Stop recording pAudioClient->Stop(); // Update WAV header std::streampos fileSize = outputFile.tellp(); outputFile.close(); UpdateWAVHeader(filename, static_cast<UINT32>(fileSize) - 44); return true;

private: void WriteWAVHeader(int dataSize, int sampleRate, int channels, int bitsPerSample) // RIFF chunk outputFile.write("RIFF", 4); int chunkSize = dataSize + 36; outputFile.write(reinterpret_cast<char*>(&chunkSize), 4); outputFile.write("WAVE", 4);

class WASAPIRecorder private: IMMDeviceEnumerator* pEnumerator = nullptr; IMMDevice* pDevice = nullptr; IAudioClient* pAudioClient = nullptr; IAudioCaptureClient* pCaptureClient = nullptr; WAVEFORMATEX* pwfx = nullptr; HANDLE hEvent = nullptr; UINT32 bufferFrameCount = 0; std::ofstream outputFile; wasapi download windows 10

bool loopback = (mode == 1);

// fmt subchunk outputFile.write("fmt ", 4); int fmtSize = 16; outputFile.write(reinterpret_cast<char*>(&fmtSize), 4); short audioFormat = 1; // PCM outputFile.write(reinterpret_cast<char*>(&audioFormat), 2); outputFile.write(reinterpret_cast<char*>(&channels), 2); outputFile.write(reinterpret_cast<char*>(&sampleRate), 4); int byteRate = sampleRate * channels * (bitsPerSample / 8); outputFile.write(reinterpret_cast<char*>(&byteRate), 4); short blockAlign = channels * (bitsPerSample / 8); outputFile.write(reinterpret_cast<char*>(&blockAlign), 2); outputFile.write(reinterpret_cast<char*>(&bitsPerSample), 2); // data subchunk outputFile.write("data", 4); outputFile.write(reinterpret_cast<char*>(&dataSize), 4); bool StartRecording(const char* filename) outputFile

public: bool Initialize(bool captureLoopback = true) HRESULT hr;

find_library(ole32_lib ole32) find_library(avrt_lib avrt) if (!outputFile.is_open()) return false

void UpdateWAVHeader(const char* filename, UINT32 dataSize) std::fstream file(filename, std::ios::binary ;